package merger

import (
	"context"
	"strings"
	"testing"

	apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
	"k8s.io/apimachinery/pkg/api/meta"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"sigs.k8s.io/controller-runtime/pkg/client/fake"
)

func TestCRDSchemaResolverReturnsServedVersionSchema(t *testing.T) {
	gv := schema.GroupVersion{Group: "core.pingcap.com", Version: "v1alpha1"}
	gvk := gv.WithKind("TiDBGroup")
	gvr := gv.WithResource("tidbgroups")
	rootSchema := objectSchema(map[string]apiextensionsv1.JSONSchemaProps{
		"spec": {Type: "object"},
	})
	crd := &apiextensionsv1.CustomResourceDefinition{
		ObjectMeta: metav1.ObjectMeta{Name: "tidbgroups.core.pingcap.com"},
		Spec: apiextensionsv1.CustomResourceDefinitionSpec{
			Group: "core.pingcap.com",
			Names: apiextensionsv1.CustomResourceDefinitionNames{
				Plural: "tidbgroups",
				Kind:   "TiDBGroup",
			},
			Scope: apiextensionsv1.NamespaceScoped,
			Versions: []apiextensionsv1.CustomResourceDefinitionVersion{{
				Name:   "v1alpha1",
				Served: true,
				Schema: &apiextensionsv1.CustomResourceValidation{OpenAPIV3Schema: &rootSchema},
			}},
		},
	}
	scheme := runtime.NewScheme()
	if err := apiextensionsv1.AddToScheme(scheme); err != nil {
		t.Fatalf("AddToScheme: %v", err)
	}
	reader := fake.NewClientBuilder().WithScheme(scheme).WithObjects(crd).Build()
	mapper := meta.NewDefaultRESTMapper([]schema.GroupVersion{gv})
	mapper.AddSpecific(gvk, gvr, gvr, meta.RESTScopeNamespace)

	resolved, err := NewCRDSchemaResolver(reader, mapper).Resolve(context.Background(), gvk)
	if err != nil {
		t.Fatalf("Resolve: %v", err)
	}
	if resolved.Properties["spec"].Type != "object" {
		t.Fatalf("resolved schema = %#v, want spec object", resolved)
	}
}

func TestCRDSchemaResolverRejectsUnservedVersion(t *testing.T) {
	gv := schema.GroupVersion{Group: "core.pingcap.com", Version: "v1alpha1"}
	gvk := gv.WithKind("TiDBGroup")
	gvr := gv.WithResource("tidbgroups")
	crd := &apiextensionsv1.CustomResourceDefinition{
		ObjectMeta: metav1.ObjectMeta{Name: "tidbgroups.core.pingcap.com"},
		Spec: apiextensionsv1.CustomResourceDefinitionSpec{
			Group: "core.pingcap.com",
			Names: apiextensionsv1.CustomResourceDefinitionNames{Plural: "tidbgroups", Kind: "TiDBGroup"},
			Versions: []apiextensionsv1.CustomResourceDefinitionVersion{{
				Name:   "v1alpha1",
				Served: false,
			}},
		},
	}
	scheme := runtime.NewScheme()
	if err := apiextensionsv1.AddToScheme(scheme); err != nil {
		t.Fatalf("AddToScheme: %v", err)
	}
	reader := fake.NewClientBuilder().WithScheme(scheme).WithObjects(crd).Build()
	mapper := meta.NewDefaultRESTMapper([]schema.GroupVersion{gv})
	mapper.AddSpecific(gvk, gvr, gvr, meta.RESTScopeNamespace)

	_, err := NewCRDSchemaResolver(reader, mapper).Resolve(context.Background(), gvk)
	if err == nil || !strings.Contains(err.Error(), "not served") {
		t.Fatalf("Resolve error = %v, want not served", err)
	}
}